Europium-Doped Hydroxyapatite: Influence of Excitation Wavelength on the Eu3+ Luminescence in the Hydroxyapatite

Flávia R.O. Silva; Nelson B. de Lima; Deiby S. Gouveia; Nildemar A.M. Ferreira; Valter Ussui; Lilia C. Courrol; Ana Helena A. Bressiani

doi:10.4028/www.scientific.net/MSF.820.335

Paper Titles

Evaluation of Morphology and Roughness of the Surface of a Ceramic Based on Lithium Disilicate, after Conditioning with Acid Hydrofluoric the 5% and 10%
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Evaluation of Mechanical Properties of Composite Materials Used in Dentistry Varying the Inorganic Composition
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Analysis of Flexural Strength of Ceramics Based on Zirconia Stabilized by Yttria with Ceramic Cover
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Phase Stability of 3Y-TSZ Ceramics after Different Surface Treatments
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Europium-Doped Hydroxyapatite: Influence of Excitation Wavelength on the Eu³⁺ Luminescence in the Hydroxyapatite
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Sinterization of Alumina and of the Alumina/Zirconia System in Microwave Ovens
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Evaluation of Organoclay Addition in Surface Modified Sintered UHMWPE Membranes for Oil Separation
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PP/EPDM Blends Compatibilized by Organically Modified Clays
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Selective Occupancy of Sites by Rare Earths in K₂Nd_(1-X)Eu_xNb₅O₁₅ Nanopowders, where X = 0, 0.0025, 0.025, 0.05 and 0.1, Prepared by Modified Polyol Method
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Europium-Doped Hydroxyapatite: Influence of Excitation Wavelength on the Eu³⁺ Luminescence in the Hydroxyapatite

Abstract:

Hydroxyapatite (HA) doped with europium (HAEu) offers the advantage of making the hydroxyapatite a fluorescent biomarker, allowing their imaging through emission in vivo and in vitro tests. Several authors had been based their studies about europium site occupation (CaI and CaII) in hydroxyapatite by the lanthanide ion luminescence, verifying the influence of the method of synthesis and concentration of the dopant ion. In this study HA nanoparticles doped with 1.4 mol% of trivalent europium were synthesized by co-precipitation method and thermal treated at different temperatures (600°C and 1200°C). A careful evaluation of the influence of the excitation wavelength of europium luminescence in the HAEu was performed and it has been verified that both the characteristics transitions of europium, at CaI and CaII sites, and the luminescent intensity are dependent on the excitation wavelength. The non-observance of this fact can lead to erroneous conclusions about the site occupation of europium in hydroxyapatites.